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alexgriva [62]
3 years ago
15

Help me with 15 16 17 and 18 please thank you so much

Chemistry
2 answers:
Oksana_A [137]3 years ago
4 0
15.c
16.the law of conservation of mass state that mass in a isolated system is niether created or destroyed.
17.you can prove that dissolving salt is a physical change by evaporating the water to separate the two.
klemol [59]3 years ago
3 0
I Know 15. Answer Is D.
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2.what is the purpose of the sodium sulfate? (1 pt) why did you rinse the sodium sulfate with an additional portion of methylene
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To ensure that the 9-Fluorenone was totally dry, it had to be washed with methylene chloride. To make sure that methylene chloride is present in a pure solution, sodium sulfate binds to water and precipitates.

<h3>What is the purpose of the sodium sulfate?</h3>
  • Although it has numerous additional uses, sodium sulfate is primarily employed in the production of detergents and in the Kraft process of paper pulping.
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  • To make sure that methylene chloride is present in a pure solution, sodium sulfate binds to water and precipitates.
  • The sodium salt of sulfuric acid is known as sodium sulfate. Na2SO4 is the chemical formula for sodium sulfate. The mineral thenardite, which is also known as anhydrous sulfate, is described as a white, crystalline solid, whereas the decahydrate Na2SO4. 10H2O is also known as Glauber's salt or the mirabilis salt.

To know more about sodium sulfate, refer:

brainly.com/question/23509646

#SPJ4

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Why cant magnesium ions be detected in a flam test?
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In converting between units, it is never necessary to use more than one conversion factor. A. True B. False
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